And since the thread is back from the dead, ill just chime in with my current feelings.
For the last 6 months or so, i've been more playing in Open. Even taking part in some CGs in open. I wanted Open to be my default mode to play in when i didn't have a good reason for not doing so (ie: returning from an exploration trip, or flying under the influence). I feel its important as many people as possible play open to keep the ratio of good people to jerks as high as possible.
However, i'm slowly beginning not to give a hoot at about that, and find myself more and more defaulting to Mobius. Why? Its not that i've had a particularly bad experience. Ok, one guy blew me up without opening comms or demanding anything, and had some fun putting a player bounty on his head. But... basically i can't be bothered with it.
The chance of good PvP doesn't bother me. I can go into CQC for that. I can meet other players and team up in Mobius just as well as i can in Open. In Open, when i've been in a RES and offered to wing up with people they (seriously, they say this) don't want to, because they worry about their precious Cr/h being affected.
I've had some good experiences in open, but its just not enough to keep me there. Ill play in Open now while out exploring, just to see where other explorers are, since most i know seem to explore in Open. But otherwise, i think i'm mainly now going to be in Mobius. Open just doesn't offer me enough to keep me there.